Rename receive/send from/to kobo as sync-from-kobo and sync-to-kobo

diff --git a/receive-from-kobo b/sync-from-kobo
similarity index 100%
rename from receive-from-kobo
rename to sync-from-kobo

diff --git a/send-to-kobo b/sync-to-kobo
similarity index 100%
rename from send-to-kobo
rename to sync-to-kobo